Comment by coldpie
17 hours ago
I have two or three that I inherited from my dad. I've never learned to use them because I haven't thought of something I'd use them for. The one thing I could think of is quickly doing fractional math while woodworking (what width will I have if I rip this 7.5" board into 4 pieces?) but in reality I just don't actually do that much math while woodworking.
As mentioned elsewhere you can use them in the kitchen if you start wanting to scale recipes at will - it's easy to double, but with a slide rule you can quickly get other ratios.
Works better when you do things by weight and metrically, no doubt.